Formation of counter flow jet resulting from impingement of multiple jets radially injected in a crossflow

The process of formation of a counter jet as a result of impinging of jets radially injected into a confined crossflow of cylindrical duct was studied experimentally and numerically. The axial temperature distributions upstream of the jet injection plane were measured at various jets/crossflow mass flow rates, also near the jet injection plane. Obtained data were analyzed, the conditions of formation of the jet toward the main flow were determined. The point estimates of axial and radial mixing fractions in overpenetration mode with counter jet formation have been obtained. Experimental data are in satisfactory agreement with the numerical analysis results. (C) 2015 Elsevier Inc. All rights reserved.